Lennox Prodigy M2 Application Manual page 88

18. Networking The Controllers
A network control panel (NCP) and NCP PC software can be used to schedule building operation for any M2 on the same
daisy−chained l connection network.
The network thermostat controller (NTC) is an L connection direct digital controller used on units which are not equipped with
an M2. The Building Controller (BC) is used to control building functions such as lights and signs. Use L connection specific
network cable and daisy chain as shown in figure 35.
Up to 31 controllers can be daisy chained on a single L connection network. Any combination of M2, M1, NTC, and BC
controller can be used (see figure 34).
Up to 31
Controllers
NON M2
BASED HVAC
SYS BUS TERMINAL
BLOCK ON LENNOX
CONTROLLERS IMC
(M1−1 TO M1−6 L
SERIES)
− G +
SHIELD
CONNECT + TERMINAL OF NCP TO + TERMINALS ON ALL CONTROLLERS.
CONNECT − TERMINAL OF NCP TO − TERMINALS ON ALL CONTROLLERS.
1
2 SHIELD
DO NOT CONNECT THE CABLE SHIELD TO THE "G" TERMINAL ON M1−6 AND OLDER
3
Figure 35. L Connection® Network Daisy−chain Communication Wiring
506457−01 05/10
Signs
Fans
NTC
BC
Lights
Figure 34 L Connection Network
.
SYS BUS TERMINAL
BLOCK ON LENNOX
CONTROLLERS IMC (M1−7,
M1−8, NTC, BC AND ZONE
CONTROLLERS)
− S +
SHIELD
M2
S−BUS TERMINAL
BLOCK ON LENNOX
PRODIGY M2 CON-
TROLLER ENER-
GENCE SERIES
− S +
Page 88
18. Networking The Controllers
PC
PC CONVERTER
PHONE MODEM
Phone
ETHERNET
LAN
CONVERTER
Network
Manager
NCP
M1
CONTINUE WIRING TYP.
TO LAST CONTROLLER
ON NETWORK
SHIELD
Cable type − twisted pair
with shield, 22 awg mini-
mum, Belden #88761 or
#8761 (Lennox 27M19,
94L63, 68M25).